Stearing turns left but nothing when it comes back

Me and my gf have a 06 Tacoma whe. She turns left it's ok but when it comes back to straight there's no power stearing but it turns right and comes right back ? Any ideas I'm a jeep guy not sure what's going g on pump? Stearing rack?

On most rack and pinion systems, there's typically a rotary valve on the rack that ports fluid to the correct side of the piston in the rack. If certain parts of the valve is leaking or clogged, this could happen. Probably looking at a rack replacement then.

Power steering fluid level OK?

Another possibility is no suspension caster in one corner. Did you buy the truck used? When was the last time an alignment was done? Is there a lift installed?